They discuss the heart and circulatory system, air respiration and the control of breathing, the digestive tract and gut development, the olfactory system, the presence of slime glands, and biochemistry and molecular biology of specific species.

Despite their vicious nature and least appealing characteristic - the stress-induced secretion of mucous from up to 200 slime glands along their bodies - hagfish are prized, particularly in Asian markets.

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